190. Presently, the world's largest and most advanced multi-purpose communication satellite is
194. The square of the period of revolution to the planet about the sun is proportional to the cubes of their mean kg. distances from the sun. The above statement is based on
195. If a satellite is orbiting at a height of h km from the surface of the earth, then its radius of orbit will be
196. If the maximum value of electron density is 1.24 x 106 cm-3, the critical frequency for reflection at vertical incidence will be nearly
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